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发明名称
Magnetic force demonstration device
摘要
申请公布号
US2700831(A)
申请公布日期
1955.02.01
申请号
US19530346703
申请日期
1953.04.03
申请人
MATHIESEN NICOLAUS P
发明人
MATHIESEN NICOLAUS P.
分类号
G09B23/18
主分类号
G09B23/18
代理机构
代理人
主权项
地址
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